# Mental Jigsaw vs Einstein Riddle Megamix

The clearest difference is in-app purchases: Mental Jigsaw at none against Einstein Riddle Megamix's 6. Mental Jigsaw also leads on ads (none vs shown) and iOS requirement (11.0 vs 15.3). Einstein Riddle Megamix's advantage is update cadence (every 4 days vs every 10 months). On price and device support there is nothing between them.

Both are free to download. Einstein Riddle Megamix sells 6 in-app purchases, starting at $0.99 per 7 days. Mental Jigsaw asks for nothing beyond the download.

Mental Jigsaw ships an update every 10 months, Einstein Riddle Megamix every 4 days. The most recent releases landed on October 17, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Mental Jigsaw | Einstein Riddle Megamix |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 10 months | **Every 4 days** |
| Size | 439 MB | 20 MB |
| Requires iOS | **11.0** | 15.3 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CNR - Istituto per le Tecnologie Didattiche](https://appshunter.io/developer/433862737) | [LIBOR MASICEK](https://appshunter.io/developer/1783292926) |

## What reviewers say

### Mental Jigsaw

[App page](https://appshunter.io/ios/app/mental-jigsaw/id1524501681)

**Features:** macOS Compatibility

**In-app purchases:** none


### Einstein Riddle Megamix

[App page](https://appshunter.io/ios/app/einstein-riddle-megamix/id6753361421)

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Supporter \| Weekly | $0.99 | per 7 days |
| Supporter \| Monthly | $1.99 | per month |
| Supporter \| Yearly | $14.99 | per year |
| +10 hints | $0.99 | one-time |
| +25 hints | $1.99 | one-time |
| +100 hints | $4.99 | one-time |


## Frequently asked questions

### Is Mental Jigsaw free?

Mental Jigsaw is free to download, with no in-app purchases.

### Is Einstein Riddle Megamix free?

Einstein Riddle Megamix is free to download, with in-app purchases available.

### Do Mental Jigsaw or Einstein Riddle Megamix have ads?

Einstein Riddle Megamix shows ads; Mental Jigsaw does not.

### Which is updated more often, Mental Jigsaw or Einstein Riddle Megamix?

Mental Jigsaw ships an update every 10 months, and Einstein Riddle Megamix every 4 days. Most recently, Mental Jigsaw was updated on October 17, 2026 and Einstein Riddle Megamix on October 14, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*